OETector Engineering
&
Technology, inc,
486 N.Wiget Lane,Walnut Creek, CA 94598USA
telephone: (925) 937-4203
fax: (925) 937-7581
DET
e-mail:
innovations in chemical detection
REMOTE FIDDETECTION (RFID) -aCFID ion source
&
collector electrodeare located several centimeters
downstream of a self-sustained Hydrogen/Methane/Air flame - ions produced by Hydrocarbon combustion
dissipate rapidly downstream of the flame, but combustion of Lead (Pb), Tin (Sn), Phosphorus (P), or Silicon (Si)
compounds produces long-lived ions that persist to be selectively detected at the downstream collector - an
organic fueled flame improves selectivity.
FLAME THERMIONIC IONIZATION DETECTION (FTID) - an electrically heated TID-1 or TID-2 ion
source located several centimeters downstream of a self-sustained Hydrogen/Methane/Air flame re-ionizes the
electronegative neutral products of the flame combustion of samples - a TID-2 source provides selectivity for
Halogenates, while aT10-1 source provides selectivity for Halogenates and Nitrogen compounds.
FLAME IONIZATION DETECTION (FlO) - an FlO Probe consisting of an uncoated bare wire loop, and a
collector electrode are located adjacent a self-sustained Hydrogen/Air flame burning at an unpolarized ceramic
tipped jet - the FlO Probe serves as flame ignitor and polarizer, and the flame ionization provides Universal
detection of organic compounds.
HOTWIRECOMBUSTION IONIZATION DETECTION (HWCID) - similar to aPTIOconfiguration except
a heated barewire FID Probe is used tomaintain an ignited Hydrogen/Air boundary layer - Universal detection
like an FlO, but sensitivity about 100 times less than an FlO - does not require a jet structure - provides about a
factor of
2
enhancement for Aromatics vs . Alkane Hydrocarbons.
'
CATALYTIC FLAME IONIZATION DETECTION (CFID) - uses
a
self-sustained flame similar to an FlO
except includes an electrically heated ceramic CFID ion source to augment the gaseous flame ionization with
surface ionization from the hot catalytic ion source - Universal detection with similar response factors for
Halogenates and Hydrocarbons.
CATALYTIC COMBUSTION IONIZATION DETECTION (CCID) - uses a catalytic TID-1 or TID-10 ion
source heated to 300 - 400°C in an oxidizing detector gas environment to ignite a momentary burst of flame
ionizationas individual peaksofhigh concentration sample compoundselute from theGCcolumn and impact the
ion source -provides selective ionization ofMethylene (CH
z )
functional groups in linear chain Alkane, FAME, and
Triglyceride compounds with discrimination vs. compounds with unsaturated Carbon double bonds.
TANDEMDETECTION (TID/NPD, NPDITID, FID/FTID, TID/FlO, etc.) -
2
simultaneous detector signals
with many different possible combinations of ion sources and detector gas environments.
REACTORTHERMIONIC IONIZATIONANALYSIS (RTIA) -stand-aloneTIDor NPD transducerattachedto a
heated inlet reactor with a sample pump pulling ambient Air through both transducer and reactor - provides selective
screeningof vaporsgeneratedbyThermal DesorptionandThermalOxidationof non-volatile constituents of liquid or solid
samples-TID-1 orTID-10, TID-3, TID-7, and NPD (TID-2orTID-4) ion sources can beused in the transducer
for different selectivities.
I
STAND-ALONE TID, NPD, OR FlO TRANSDUCERS - transducer exit connected to a sampling pump
provides real timemonitoringofselectiveor universal organic vapors in incoming ambientAir stream _selectivity
determined by type of ion source element installed.
